—
17
—
from Switch B to C will interconnect automatically; this way there is no
stoppage.
The bypass relay function helps the network recover from single-node
failures in a linear topology.
With the maximum segment length of category 5 twisted-pair cable being 100
meters, cable length must be considered when designing a network that
utilizes this function. For example, the total length of the cables from Switch
A to B and from B to C must be no more than 100 meters. This way, if the
two adjacent nodes (switch B and C for example) encounter a power failure,
there will be no stoppage, provided that the total length of the cables A-to-B,
B-to-C, and C-to-D are no more than 100 meters.
The bypass relay function works best for networks with linear topologies.
ToughNet™ switches with bypass relay function are not recommended to be
used in networks that employ ring topologies because network loops may
occur when redundancy protocols such as RSTP or TurboRing™ are applied.
LED Indicators
Several LED indicators are located on the ToughNet switch’s front panel.
The function of each LED is described in the table below.
LED
Color
State
Description
System LEDs
ON
Power is being supplied to power input
PWR1.
PWR1
AMBER
OFF
Power is not being supplied to power input
PWR1
ON
Power is being supplied to power input
PWR2.
PWR2
AMBER
OFF
Power is not being supplied to power input
PWR2.
ON
When the corresponding PORT alarm is
enabled, and a user-configured event is
triggered.
FAULT
RED
OFF
When the corresponding PORT alarm is
enabled and a user-configured event is not
triggered, or when the corresponding PORT
alarm is disabled.
MSTR/
HEAD
GREEN
ON
When the TN switch is either the Master of
this Turbo Ring, or the Head of this Turbo
Chain.
Bypassing
Switch A
Switch B
Switch C
Switch D
